FamilySearch tools window: layout, editor context, and link button UX improvements

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Summary

Three improvements to the FamilySearch Tools window, built on the existing
pr-2147-fs-login integration.

1. Reorganize FamilySearch tools window layout

Before:

After:

Moves the FS connection status widget from the top of the window to a
bottom status bar, giving the active person name full-width prominence.
Places the Link FamilySearch ID button directly below the person name,
above the notebook tabs. Replaces the Person actions FlowBox with three
explicit rows: Compare on its own row, Sync from/Sync to on one row, and
Export to FamilySearch on its own row. This gives each action a clear
visual hierarchy and avoids buttons wrapping unpredictably at narrow widths.

2. Clear editor context when Edit Person window is closed

The tools window previously kept the person name and all action buttons
active after the Edit Person dialog was closed, because the window-destroy
signal was never handled. This change connects to destroy on the editor
window and clears _LAST_EDITOR when the tracked editor closes, triggering
an immediate UI refresh so the name resets to "(none)" and all
person-specific buttons are disabled.

3. Change Link button label and sensitivity based on FSFTID state

When an Edit Person window is open:

• If the person already has an _FSFTID attribute, the button reads
  "Edit FamilySearch ID" and all other action buttons remain enabled.
• If the person has no _FSFTID attribute, the button reads
  "Add FamilySearch ID" and all other action buttons are disabled
  until an ID is linked.

The FSFTID check reads from the live in-memory editor object (not the
database copy), so a freshly typed ID is detected immediately — even before
the person is saved.

Test plan

• Open the FamilySearch Tools window with no Edit Person window open → all person-specific buttons disabled, label shows "(none)", Link button shows "Link FamilySearch ID"
• Open Edit Person for a person without an _FSFTID attribute → Link button shows "Add FamilySearch ID", all other action buttons are disabled
• Use "Add FamilySearch ID" to link an ID → button switches to "Edit FamilySearch ID" and other buttons become enabled
• Open Edit Person for a person who already has an _FSFTID → Link button shows "Edit FamilySearch ID", all other buttons enabled
• Close the Edit Person window → name resets to "(none)", all person-specific buttons disabled

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